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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4305) Add a configurable limit on number of blocks per file, and min block size
Date Wed, 10 Apr 2013 20:11:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13628191#comment-13628191
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Suresh Srinivas commented on HDFS-4305:
---------------------------------------

bq. I don't think it's in the best interest of the project if the setup instructions involve
changing a bunch of things away from unsafe defaults.
Fair point.

bq. Similarly, waiting until after a production incident to make the user then go and learn
about a better default is not very user-centric.
How many incidents of this nature you have observed so far?

                
> Add a configurable limit on number of blocks per file, and min block size
> -------------------------------------------------------------------------
>
>                 Key: HDFS-4305
>                 URL: https://issues.apache.org/jira/browse/HDFS-4305
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 1.0.4, 3.0.0, 2.0.2-alpha
>            Reporter: Todd Lipcon
>            Assignee: Andrew Wang
>            Priority: Minor
>         Attachments: hdfs-4305-1.patch
>
>
> We recently had an issue where a user set the block size very very low and managed to
create a single file with hundreds of thousands of blocks. This caused problems with the edit
log since the OP_ADD op was so large (HDFS-4304). I imagine it could also cause efficiency
issues in the NN. To prevent users from making such mistakes, we should:
> - introduce a configurable minimum block size, below which requests are rejected
> - introduce a configurable maximum number of blocks per file, above which requests to
add another block are rejected (with a suitably high default as to not prevent legitimate
large files)

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